ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.6 > T50.6X > T50.6X6 T50.6X6 Underdosing of antidotes and chelating agents Non-Billable/Non-Specific Codes T50.6X6A..., initial encounterT50.6X6D..., subsequent encounterT50.6X6S..., sequela